:root {
  --bg: #f7f7f8;
  --surface: #ffffff;
  --soft: #f3f4f6;
  --text: #18181b;
  --muted: #71717a;
  --border: #e4e4e7;
  --border-strong: #d4d4d8;
  --accent: #18181b;
  --accent-fg: #ffffff;
  --error: #b91c1c;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --radius: 14px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- LOGIN ---------- */
.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-wrap {
  width: 100%;
  max-width: 380px;
}
.login-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow-md);
}
.login-input {
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  outline: 0;
  background: transparent;
  font-size: 16px;
  padding: 12px 14px;
  color: var(--text);
  width: 100%;
  min-width: 0;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease;
  font-family: inherit;
}
.login-input::placeholder { color: var(--muted); }
.login-input:focus { background: #fafafa; }
.login-input:disabled { opacity: 0.6; }
.login-input.is-error { color: var(--error); }
.login-btn {
  border: 0;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: var(--radius-sm);
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.05s ease;
}
.login-btn:hover { opacity: 0.9; }
.login-btn:active { transform: scale(0.98); }
.login-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.login-msg {
  grid-column: 1 / -1;
  font-size: 13px;
  color: var(--error);
  padding: 2px 6px 4px;
  font-variant-numeric: tabular-nums;
}

/* ---------- CATALOG ---------- */
.catalog-body { min-height: 100vh; }
.catalog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 32px 16px;
  max-width: 1100px;
  margin: 0 auto;
}
.crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 6px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  min-width: 0;
}
.crumb,
.crumb:link,
.crumb:visited {
  color: var(--muted);
  text-decoration: none;
  padding: 2px 4px;
  border-radius: 6px;
  transition: color 0.15s ease, background 0.15s ease;
  max-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
a.crumb:hover {
  color: var(--text);
  background: var(--surface);
}
.crumb-current {
  color: var(--text);
  cursor: default;
}
.crumb-sep {
  color: var(--border-strong);
  font-weight: 400;
  user-select: none;
}
.logout-form { margin: 0; }
.logout-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.logout-btn:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface);
}
.catalog-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 32px 64px;
}
.card-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.card,
.card:link,
.card:visited {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 140px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.card-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.005em;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-word;
}
.card-date {
  font-size: 13px;
  color: var(--muted);
  margin-top: 16px;
  font-variant-numeric: tabular-nums;
}
.card-folder {
  background: #fcfcfc;
}
.card-folder:hover { background: var(--surface); }
.card-icon {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: var(--soft);
  color: #52525b;
  margin-bottom: 10px;
}
.card-folder .card-title {
  -webkit-line-clamp: 2;
}
.empty {
  text-align: center;
  padding: 96px 16px;
  color: var(--muted);
}
.empty-title {
  font-size: 18px;
  color: var(--text);
  margin: 0 0 8px;
  font-weight: 600;
}
.empty-sub { font-size: 14px; margin: 0; }
.empty code {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 12.5px;
}

@media (max-width: 600px) {
  .catalog-header { padding: 20px 20px 12px; }
  .catalog-main { padding: 8px 20px 48px; }
}